The COMMUNITY HEALTH INDEX NUMBER (CHI NUMBER) uniquely identifies a PATIENT on the Community Health Index (Scotland) within the NHS in Scotland.  It is the equivalent of the NHS NUMBER in England and Wales.

The COMMUNITY HEALTH INDEX NUMBER is ten numeric digits in length, and is constructed as follows:

• PERSON BIRTH DATE (in format DDMMYY);
• two further digits;
• a ninth digit which is always an even number for females and an odd number for males;
• an arithmetical check digit.

Further information on the COMMUNITY HEALTH INDEX NUMBER can be found at the ISD Scotland website.

This attribute is also known by these names:

Context	Alias
alsoknownas	CHI NUMBER
plural	COMMUNITY HEALTH INDEX NUMBERS